Understanding ISRO's Communication Satellite Launches

The question asks to identify the specific communication satellite launched by ISRO in December 2020, which was also the 42nd communication satellite launched by the organization.

ISRO (Indian Space Research Organisation) regularly launches various types of satellites for different purposes, including communication, earth observation, navigation, and scientific research. Communication satellites are crucial for providing services like television broadcasting, telecommunications, internet connectivity, and disaster management support.

Identifying the December 2020 ISRO Launch

To answer this question, we need to recall or find information about ISRO's satellite launch activities in December 2020. Historical records show that ISRO had a significant launch during that period.

Let's look at the options provided:

1. CMS - 01
2. GSAT - 31
3. INSAT - 4CR
4. GSAT - 30

By checking ISRO's launch history around December 2020, we can determine which satellite was launched.

Analysis of Launch Information

ISRO's records indicate the following:

• CMS-01: Launched on December 17, 2020, by PSLV-C50. It is described as India's 42nd communication satellite.
• GSAT-31: Launched on February 6, 2019, from Kourou, French Guiana, using the Ariane-5 rocket.
• INSAT-4CR: Launched on September 2, 2007, by GSLV-F04. This was an earlier generation satellite.
• GSAT-30: Launched on January 17, 2020, from Kourou, French Guiana, using the Ariane-5 rocket.

Based on this information, the satellite launched by ISRO in December 2020, which aligns with the description of being the 42nd communication satellite, is CMS-01.

Details about CMS-01

CMS-01 is a communication satellite designed to provide services in the Extended-C Band frequency spectrum. Its coverage includes the Indian mainland, Andaman-Nicobar, and Lakshadweep Islands. It is intended to replace the ageing GSAT-12 satellite.

Therefore, CMS-01 fits all the criteria mentioned in the question.

Revision Table: Key ISRO Launches

Additional Information: ISRO and Communication Satellites

ISRO has been instrumental in developing India's satellite communication capabilities. Communication satellites play a vital role in various sectors in India:

• Telecommunications: Connecting remote areas and providing mobile services.
• Television Broadcasting: Enabling DTH (Direct-to-Home) services.
• Internet Services: Providing broadband access, especially in underserved regions.
• Education: Supporting distance learning programs (e.g., EDUSAT series).
• Disaster Management: Providing communication links during emergencies.
• Weather Forecasting: Although primarily meteorological, some communication capabilities assist in data transmission.

ISRO utilizes its own launch vehicles like PSLV (Polar Satellite Launch Vehicle) and GSLV (Geosynchronous Satellite Launch Vehicle) for most launches, but sometimes uses foreign launchers like Ariane for heavier satellites.